Difference between revisions of "Formatting"
From Suhrid.net Wiki
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printf("format string", argument(s)); | printf("format string", argument(s)); | ||
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== Format String == | == Format String == | ||
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* Syntax: | * Syntax: | ||
%[arg_index$][flags][width][.precision] conversion_char | %[arg_index$][flags][width][.precision] conversion_char | ||
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| + | * Every argument must have a format string in the above syntax, or it wont be printed! | ||
Arguments within [] are optional. Only the conversion_char is mandatory. The following are the conversion chars: | Arguments within [] are optional. Only the conversion_char is mandatory. The following are the conversion chars: | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
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| + | * flags | ||
| + | ** "-" : Left justify | ||
| + | ** | ||
[[Category:OCPJP]] | [[Category:OCPJP]] | ||
Revision as of 01:19, 8 July 2011
Introduction
- String formatting can be done using the printf() and the format() methods added in java.io.PrintStream (System.out is a PrintStream)
- Internally they ise the java.util.Formatter class.
- Basic format:
printf("format string", argument(s));
Format String
- Syntax:
%[arg_index$][flags][width][.precision] conversion_char
- Every argument must have a format string in the above syntax, or it wont be printed!
Arguments within [] are optional. Only the conversion_char is mandatory. The following are the conversion chars:
- b - boolean
- c - char
- d - integer
- f - floating point
- s - string
Optional arguments
- arg_index is the number of the argument followed by a $. The no starts from 1.
System.out.printf("%2$s , %1$s", "Suhrid", "Karthik");
//Prints : Karthik, Suhrid
- flags
- "-" : Left justify
